Answer / nibel

actually the battery charger should deliver 10-20% more than the battery voltage rating. if its exceeds there will be the chances of explosion.
no need to worry about the polarity but the voltage rating matters.

Answer / soumaydeepmaity

when u connect an LED with two 1.5 cells they will glow and if u add another two they will glow more.similarly when u will connect your batteries with two sources it will get charged quickly .

Which of the following are the important limitations of rod gap surge arresters? 1. They are not capable of selling off power frequency follow up current. 2. After a discharge, the rods are destroyed completely. 3. Performance is affected by climatic conditions. Use the following codes for selecting the correct answer. Codes: (a)1, 2 and 3 (b)1 and 2 (c)2 and 3 (d)1 and 3

1 Answers  

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When measuring the Insulation resistance of a motor winding (winding to earth) using a megger meter, Applied voltage(1000V) was automatically reduced to 500V. and the measured insulation resistance values are also very low (in Kohm range) Can anyone give me a reason???

3 Answers  

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In Generator How suction compression power and exhaust works ?

0 Answers   Sify,

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What is the difference b/w chock and ballast?

2 Answers   Emami,

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It is advisable 2 use auto-transformer if transformation ratio is-a)110KV/11KV,b)230kv/110kv,c)110kv/66kv,d) 400kv/230kv

2 Answers  

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Explain the role of a car driver as one of a feedback mechanism.

0 Answers   GE,

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What is diversity factor in electric installations?

0 Answers  

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how to increase the power factor in machines

5 Answers  

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What is meaning of DRU in gen.of AVR.

2 Answers  

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What are the applications of the electric motors?

0 Answers  

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how can we decide where we have to DYn11 or other vector group transformer

4 Answers   BSL, Knight Frank, Security Printing and Minting Corporation of India Limited,

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What is VCB? where it is installed at SP. What is SP?

0 Answers  

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